/*
* JBoss, Home of Professional Open Source
* Copyright 2008, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.xnio;
import java.io.Closeable;
import java.io.IOException;
import java.lang.ref.WeakReference;
/**
* A {@code Closeable} that holds a weak reference to another {@code Closeable}, which can be used to close the other
* without creating a strong reference to it.
*
* @apiviz.exclude
*/
public final class WeakCloseable implements Closeable {
private final WeakReference<Closeable> resource;
/**
* Construct a new instance.
*
* @param resource the target resource
*/
public WeakCloseable(final WeakReference<Closeable> resource) {
this.resource = resource;
}
/**
* Construct a new instance.
*
* @param resource the target resource
*/
public WeakCloseable(final Closeable resource) {
this.resource = new WeakReference<Closeable>(resource);
}
/**
* Closes this resource and releases any system resources associated with it. If the resource is already closed,
* then invoking this method has no effect. In addition, if the resource has already been garbage collected, this
* operation has no effect.
*/
public void close() throws IOException {
final Closeable closeable = resource.get();
if (closeable != null) {
closeable.close();
}
}
}